How can we make the biomes and dimensions you explore better? What biomes or dimensions are we currently missing? Why do we need them and what makes them unique?

Bubble Column Dimension

This is an idea for a Water themed dimension. There are a couple other descriptions for water dimensions out there, but mine might be wildly different.

Like other dimensions it would be surrounded by void. The main "matter" of this dimension is tubular in shape. Perhaps a width of only 400 blocks? The tube is completely waterlogged and it is made up of bubble streams that go up and down. In between these streams are structures made of coral/unique-blocks that layer over each other like floors of a never-ending building.

I say never ending because the generation of this dimension is infinite vertically. You can get caught in a bubble column going up, and the game just continues to generate sub-chunks vertically. Going down would create sub-chunks in the opposite direction. It would always be waterlogged and there would always be tubes of coral structures to land on if you're wanting to get out of the bubble columns.

Going OUTSIDE the water causes you fall SIDEWAYS, which would push you pass a limit and kill you, (similar to the End). After death you'd return to bed/spawn. This would make battles difficult in the dimension, as simply being pushed out of the water changes your direction of gravity. Better have ender-pearls!

There is a main Portal in the dimension, similar to the End, that takes you back to the Overworld. Several outpost portals along the tube will take you back to the main portal.

Alternatively you could have a mechanic similar to the Nether where portals between the dimensions are dependent on the XYZ. However, this would create a unique algorithm. The Overworld and Nether are horizontal dimensions. Since this water dimension is vertical, you'd have to switch axes. So being 4000 Y in the water dimension would equate to some number on the X or Z axes in the Overworld. How'd this work could be complicated, but if successful it would be a very fun mechanic.

Mobs: Water mobs that aren't affected by the bubble streams. Fish perhaps could spawn here, but unique mobs would likely live here. Mermaids perhaps. Large electric eels. A boss mob could exist such as a water dragon or kraken. Perhaps this is the home of Guardians.

Structures: The main structure that repeats every sub chunk with variation would be the tubes of coral/prismarine/something that reside next to the bubble columns. Perhaps every once in a while a sub-chunk will generate a large structure that connects into one mega structure with the bubble columns going straight through.

Blocks: Perhaps coral bricks and prismarine? Or bring back the Crying Obsidian. Perhaps a new block that is pastel orange and mimics PurPur.

(If going infinite vertically is too much for the developers, perhaps after 10,000 sub-chunks, it automatically connects to -10,000 sub-chunk. Creating a ring?)

Mostly, this idea is about exploring a different perspective. Overworld, End, and Nether are all horizontal worlds. They end vertically, but continue infinitely in the horizontal plane.

It be an interesting to flip that. The horizontal ends abruptly and the vertical is infinite.

It doesn't necessarily need to be "water" based. I went with water because it's different from Nether or End, and swimming would be easier to traverse in a vertical world like I described. Maybe you don't even need the bubble columns, but I added them because it be a quick way to move through the dimension. The bubble columns would require different mechanics here. If the user were to build through them, it shouldn't cut off the column. Sponge might not have the ability to work in this dimension either. I'm not sure if mechanics like that could be sorted out.

Strangely I normally don’t vote for the wacky and weird ideas like this but actually I sort of like it. The creativity in this is really cool and I like it, but there is one thing i’d Like to know. What would be the point of coming to this dimension. The nether has quartz, lots of stuff for potions, warts and netherack. This dimension has all stuff from the oceans in the over world and you don’t sound confident in any of the structures, mobs, and new blocks. I’d like if could maybe make seperate posts about the stuff in this dimension. Thx for reading this and I hope you respond! 😜

I suppose the focus of my idea here is mostly on the schematics. It's a vertical dimension. I made it a Bubble Column dimension because bubble columns by definition are vertical transport systems. I thought it would help the reader visualize what I'm trying to describe.

Structures in the Water themed dimension could be unique towers of coral, prismarine, and sea lanterns. Like small caverns piled up on one another. Places to swim into and rest. Inside would be new eel mobs that don't like you encroaching on their territory.

However, if I'm honest I don't think Mojang will make a dimension based off of a physical element. The Nether is a metaphor for Hell. The End is a eerie abyss, maybe even something that represents purgatory or the aether.

I think if there were to be a new Dimension theme it could be a Light/Heaven/Sky dimension. It should focus on brightness. Perhaps Fusion Blocks, blocks of pure light. Or a new light orange/yellow building block call Honeystone. Cloud blocks could form there and can be mined with silk touch. Frail creatures that look almost angelic could reside there. Perhaps Gold plated golems could protect structures of some sort...